A Single Phase Acid for One Step Removal of Organic Deposition and Inorganic Scale
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摘要: 近井地带有机垢和无机垢的沉积严重影响了油气正常生产，常规解堵体系无法同时解除有机、无机及其混合垢。针对上述问题，开发了一种新型多功能解堵体系—单相酸体系，该体系由2种不相溶的液体（溶有机垢的芳烃溶剂和溶无机垢的酸液）、表面活性剂、助表面活性剂及功能型添加剂组成。采用电导率仪、粒度分析仪、旋转岩盘仪、界面张力仪、润湿角测定仪、摩阻仪、岩心流动仪、CT扫描等实验仪器对单相酸体系的性能进行了系统分析评价。实验结果表明，单相酸体系是一种外相为油、内相为酸的纳米均相分散体系，粒径分布为7～50 nm；界面张力为0；具有解除储层乳化（破乳率大于90%）、水锁、润湿改性的性能（油湿改性为水湿）；可同时溶解有机垢、无机垢及其混合垢（溶解率100%），岩心伤害渗透率恢复率大于100%；具有低摩阻性能（降阻率大于80%），可实现大排量解堵作业；具有高缓速率性能（缓速率大于99%），可实现储层深部解堵。单相酸体系利用油、酸互溶原理，实现了有机垢、无机垢及其混合垢单步同时溶解，对油气井及转注井近井地带混合垢污染物的高效解除具有重要意义。单相酸体系在伊拉克米桑油田进行了现场试验，增产效果显著。Abstract: The deposition of organic and inorganic scales in the near wellbore zone seriously affects the normal production of oil and gas. Conventional blockage removal systems cannot simultaneously remove organic, inorganic, and their mixed scales. A new multifunctional unblocking system, single phase acid, has been developed to solve the above issues. The system consists of two immiscible liquids (aromatic solvent for organic scale and acid solution for inorganic scale), surfactants, cosurfactants, and functional additives. The performance of single phase acid system was systematically analyzed and evaluated using experimental instruments such as rotary rock disk analyzer, conductivity meter, particle size analyzer, interfacial tension meter, wetting angle tester, friction meter, core flow meter, CT scanning, etc. The experimental results show that the single phase acid is a nano homogeneous dispersion system with an external phase of oil and an internal phase of acid, with a particle size distribution of 7-50 nm;The interfacial tension is 0; It has the performance of relieving reservoir emulsification (demulsification rate greater than 90%), water locking, and wetting modification (oil wet modification to water wet); it can simultaneously dissolve organic scale, inorganic scale, and their mixed scale (dissolution rate 100%); low friction resistance (lower resistance rate greater than 80%), and can achieve large injection rate operations; It has high retarded rate (retarded rate greater than 99%) and can achieve deep depth of reservoirs. Single phase acid utilizes the principle of mutual solubility between oil and acid to achieve the simultaneous dissolution of organic scale, inorganic scale, and their mixed scale in a one step. It is of great significance for the efficient removal of mixed scale pollutants in the near-well area of oil and gas Wells and transfer Wells. Single phase acid system has been carried out field test in Missan Oilfield in Iraq, and get good stimulation result.
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Key words:
- Single phase acid /
- Organic deposition /
- Inorganic scale /
- Nanodispersion system /
- One step
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表 2 溶解有机垢、无机垢及其混合垢数据
解堵液 溶解有机垢
效率/%溶解无机垢
效率/%溶解混合垢
效率/%单相酸 100 100 100.00 盐酸 0 100 56.88 芳烃溶剂 100 0 25.69 
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表 3 砂岩混合垢伤害模拟
岩心 K0/mD Kd/mD 伤害率/% 2-1 168 0.0186 99.99 2-2 163 0.0039 99.99 2-3 180 0.0102 99.99 2-4 177 0.0082 99.99
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表 4 砂岩混合垢解除实验
岩心 酸液
体系K0/
mDKd/
mDK解除后/
mDPV 伤害
解除率/%2-1 单相酸
（土酸）168 0.0186 258.943 5 154.13 2-2 单相酸
（氟硼酸）163 0.0039 198.187 5 121.59 2-3 土酸 180 0.0102 128.021 5 71.12 2-4 芳烃溶剂 177 0.0082 90.496 5 51.13
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